Abstract

Recently, the μ-photoluminescence spectroscopy or near-field scanning optical microscopy revealed polarization-dependent doublet structures of excitons with fine splitting of about several tens of μeV¹ as well as a very narrow linewidth of the same order of magnitude.^1-3 A localized exciton at a monolayer-high island in narrow quantum wells (QWs) can be regarded as a weakly confined quantum dot (QD)-like state.

© 1999 Optical Society of America